Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 3 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/27/2021   22:58:56   (   0.03,-137.21) (  -0.69,-140.41)  364.23                80
 03/28/2021   22:39:08   (   0.04,-137.21) (   0.34,-135.82)  158.66                29
 03/30/2021   11:01:27   (  -0.04,-137.21) (   0.83,-141.00)  431.61                80
 03/31/2021   10:39:49   (  -0.04,-137.21) (  -0.19,-136.41)   90.68                80
 04/02/2021   22:45:08   (   0.04,-137.19) (   0.04,-137.03)   17.08                80
 04/05/2021   10:47:39   (  -0.03,-137.16) (   0.11,-137.62)   53.40                80
 04/06/2021   10:26:03   (  -0.02,-137.15) (  -0.97,-133.05)  468.17                80
 04/07/2021   22:47:38   (   0.02,-137.12) (  -0.25,-138.25)  128.41                80
 04/08/2021   22:31:21   (   0.02,-137.11) (   0.78,-133.66)  393.07                80